<template>
  <div class="box">
    <menu class="menu">

      <div class="menu__item active" style="--bgColorItem: #ff8c00;">
        <svg class="icon" viewBox="0 0 24 24">
          <path d="M3.8,6.6h16.4" />
          <path d="M20.2,12.1H3.8" />
          <path d="M3.8,17.5h16.4" />
        </svg>
      </div>

      <div class="menu__item" style="--bgColorItem: #f54888;">
        <svg class="icon" viewBox="0 0 24 24">
          <path
            d="M6.7,4.8h10.7c0.3,0,0.6,0.2,0.7,0.5l2.8,7.3c0,0.1,0,0.2,0,0.3v5.6c0,0.4-0.4,0.8-0.8,0.8H3.8
        C3.4,19.3,3,19,3,18.5v-5.6c0-0.1,0-0.2,0.1-0.3L6,5.3C6.1,5,6.4,4.8,6.7,4.8z"
          />
          <path d="M3.4,12.9H8l1.6,2.8h4.9l1.5-2.8h4.6" />
        </svg>
      </div>

      <div class="menu__item" style="--bgColorItem: #4343f5;">
        <svg class="icon" viewBox="0 0 24 24">
          <path d="M3.4,11.9l8.8,4.4l8.4-4.4" />
          <path d="M3.4,16.2l8.8,4.5l8.4-4.5" />
          <path d="M3.7,7.8l8.6-4.5l8,4.5l-8,4.3L3.7,7.8z" />
        </svg>
      </div>

      <div class="menu__item" style="--bgColorItem: #e0b115;">
        <svg class="icon" viewBox="0 0 24 24">
          <path
            d="M5.1,3.9h13.9c0.6,0,1.2,0.5,1.2,1.2v13.9c0,0.6-0.5,1.2-1.2,1.2H5.1c-0.6,0-1.2-0.5-1.2-1.2V5.1
          C3.9,4.4,4.4,3.9,5.1,3.9z"
          />
          <path d="M4.2,9.3h15.6" />
          <path d="M9.1,9.5v10.3" />
        </svg>
      </div>

      <div class="menu__item" style="--bgColorItem:#65ddb7;">
        <!-- <svg class="icon" viewBox="0 0 24 24" >
        <path  d="M5.1,3.9h13.9c0.6,0,1.2,0.5,1.2,1.2v13.9c0,0.6-0.5,1.2-1.2,1.2H5.1c-0.6,0-1.2-0.5-1.2-1.2V5.1
          C3.9,4.4,4.4,3.9,5.1,3.9z"/>
        <path  d="M5.5,20l9.9-9.9l4.7,4.7"/>
        <path  d="M10.4,8.8c0,0.9-0.7,1.6-1.6,1.6c-0.9,0-1.6-0.7-1.6-1.6C7.3,8,8,7.3,8.9,7.3C9.7,7.3,10.4,8,10.4,8.8z"/>
      </svg> -->
        <svg t="1623042229756" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="1129" width="16" height="16"><path fill="red" d="M805.236364 280.824242H280.824242c-9.309091 0-15.515152-6.206061-15.515151-15.515151s6.206061-15.515152 15.515151-15.515152h524.412122c9.309091 0 15.515152 6.206061 15.515151 15.515152s-6.206061 15.515152-15.515151 15.515151zM805.236364 532.169697H280.824242c-9.309091 0-15.515152-6.206061-15.515151-15.515152s6.206061-15.515152 15.515151-15.515151h524.412122c9.309091 0 15.515152 6.206061 15.515151 15.515151s-6.206061 15.515152-15.515151 15.515152zM805.236364 766.448485H280.824242c-9.309091 0-15.515152-6.206061-15.515151-15.515152s6.206061-15.515152 15.515151-15.515151h524.412122c9.309091 0 15.515152 6.206061 15.515151 15.515151s-6.206061 15.515152-15.515151 15.515152zM218.763636 280.824242h-4.654545c-9.309091 0-15.515152-6.206061-15.515152-15.515151s6.206061-15.515152 15.515152-15.515152h4.654545c9.309091 0 15.515152 6.206061 15.515152 15.515152s-7.757576 15.515152-15.515152 15.515151zM218.763636 532.169697h-4.654545c-9.309091 0-15.515152-6.206061-15.515152-15.515152s6.206061-15.515152 15.515152-15.515151h4.654545c9.309091 0 15.515152 6.206061 15.515152 15.515151s-7.757576 15.515152-15.515152 15.515152zM218.763636 766.448485h-4.654545c-9.309091 0-15.515152-6.206061-15.515152-15.515152s6.206061-15.515152 15.515152-15.515151h4.654545c9.309091 0 15.515152 6.206061 15.515152 15.515151s-7.757576 15.515152-15.515152 15.515152z" p-id="1130" /></svg>
      </div>

      <div class="menu__border" />

    </menu>

    <div class="svg-container">
      <svg viewBox="0 0 202.9 45.5">
        <clipPath id="menu" clipPathUnits="objectBoundingBox" transform="scale(0.0049285362247413 0.021978021978022)">
          <path
            d="M6.7,45.5c5.7,0.1,14.1-0.4,23.3-4c5.7-2.3,9.9-5,18.1-10.5c10.7-7.1,11.8-9.2,20.6-14.3c5-2.9,9.2-5.2,15.2-7
          c7.1-2.1,13.3-2.3,17.6-2.1c4.2-0.2,10.5,0.1,17.6,2.1c6.1,1.8,10.2,4.1,15.2,7c8.8,5,9.9,7.1,20.6,14.3c8.3,5.5,12.4,8.2,18.1,10.5
          c9.2,3.6,17.6,4.2,23.3,4H6.7z"
          />
        </clipPath>
      </svg>
    </div>
  </div>
</template>

<script>
export default {
  mounted() {
    const body = document.body
    const bgColorsBody = ['#ffb457', '#ff96bd', '#9999fb', '#ffe797', '#cffff1']
    body.style.backgroundColor = bgColorsBody[0]
    const menu = body.querySelector('.menu')
    const menuItems = menu.querySelectorAll('.menu__item')
    const menuBorder = menu.querySelector('.menu__border')
    let activeItem = menu.querySelector('.active')

    function clickItem(item, index) {
      menu.style.removeProperty('--timeOut')

      if (activeItem == item) return

      if (activeItem) {
        activeItem.classList.remove('active')
      }

      item.classList.add('active')
      body.style.backgroundColor = bgColorsBody[index]
      activeItem = item
      offsetMenuBorder(activeItem, menuBorder)
    }

    function offsetMenuBorder(element, menuBorder) {
      const offsetActiveItem = element.getBoundingClientRect()
      const left = Math.floor(offsetActiveItem.left - menu.offsetLeft - (menuBorder.offsetWidth - offsetActiveItem.width) / 2) + 'px'
      menuBorder.style.transform = `translate3d(${left}, 0 , 0)`
    }

    // offsetMenuBorder(activeItem, menuBorder);

    menuItems.forEach((item, index) => {
      item.addEventListener('click', () => clickItem(item, index))
    })

    window.addEventListener('resize', () => {
      offsetMenuBorder(activeItem, menuBorder)
      menu.style.setProperty('--timeOut', 'none')
    })
  }
}
</script>

<style scoped lang='scss'>

.box{
    --bgColorMenu : #1d1d27;
    --duration: .7s;
    --time0ut: translate3d(0px, 0px, 0px);//设置默认选中的初始值
    height: 100%;
    overflow: hidden;
    // background-color: #ffb457;
    -webkit-tap-highlight-color: transparent;
    transition: background-color var(--duration);
}

.menu{

    margin: 0;
    display: flex;
    /* Works well with 100% width  */
    width: 32.05em;
    font-size: 1.5em;
    padding: 0 2.85em;
    position: fixed;
    align-items: center;
    justify-content: center;
    background-color: var(--bgColorMenu);
    bottom: 0;
    left: 0;

}

.menu__item{

    all: unset;
    flex-grow: 1;
    z-index: 100;
    display: flex;
    cursor: pointer;
    position: relative;
    border-radius: 50%;
    align-items: center;
    will-change: transform;
    justify-content: center;
    padding: 0.55em 0 0.85em;
    transition: transform var(--timeOut , var(--duration));

}

.menu__item::before{

    content: "";
    z-index: -1;
    width: 4.2em;
    height: 4.2em;
    border-radius: 50%;
    position: absolute;
    transform: scale(0);
    transition: background-color var(--duration), transform var(--duration);

}

.menu__item.active {

    transform: translate3d(0, -.8em , 0);

}

.menu__item.active::before{

    transform: scale(1);
    background-color: var(--bgColorItem);

}

.icon{

    width: 2.6em;
    height: 2.6em;
    stroke: white;
    fill: transparent;
    stroke-width: 1pt;
    stroke-miterlimit: 10;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 400;

}

.menu__item.active .icon {

    animation: strok 1.5s reverse;

}

@keyframes strok {

    100% {

        stroke-dashoffset: 400;

    }

}

.menu__border{

    left: 0;
    bottom: 99%;
    width: 10.9em;
    height: 2.4em;
    position: absolute;
    clip-path: url(#menu);
    will-change: transform;
    background-color: var(--bgColorMenu);
    transition: transform var(--timeOut , var(--duration));

}

.svg-container {

    width: 0;
    height: 0;
}

@media screen and (max-width: 50em) {
    .menu{
        font-size: .8em;
    }
}
</style>
